I need solutions please

Second Question (20 Marks ): The longest pipe run of the shown hot water heating system is 60m. The heating c a radiator is as indicated on the table below. The hot water temperature drop is 10 capacity for each increases in the linear pipe length due to the fittings. The domestic hot wat 10C. Assume 50% the following: (a)Capacity and he 716. (b)The diameter of the supply pipes A-B, C-D, E-F and G-H. (c) The diameter of the return pipes V-O and M-N